It's about coverage and not about pure performance. If you can wire from your main router to WAPs then that's about the best setup there is.

Now about switching to the best spot. I think this is a very common complaint and it's about Ubitiqu or any router make or model but usually all about how we wish the OSes would switch but here's the deal. If you have WAPs a switch can upset a video feed, download or something else so most OSes will hang on for dear life to a working connection even if it slows and there's a faster connection. I'm going to write that THIS IS NOT A BUG.

At home I have 2 2.4GHz spots and 2 5GHz spots. Coverage is great for over 3K square feet.